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maverick121
how do you solve a binomial question
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Suppose that 90% of students taking English pass the course What is the probability that at least 2 in a class of 20 will fail the course
binomial theorm is nothing to find order of nth term of calculation suppose \[(x+a)^{1}=1co x^{1 }+1c1 a^{1}\] \[(x+a)^{2}= [2co x ^{2} a ^{0}+ 2c1 x ^{1}a ^{1}+2c2 x ^{0}a ^{2}\] ..... \[(x+a)^{n}= nc0 x ^{n}a ^{0}+ nc1 x ^{n-1}a ^{1}+ nc2 x ^{n-2}a ^{2}+............+ncn-1.x ^{1}+a ^{n-1} +ncn x ^{0}a ^{n}\]